The Elhaik viewpoint holds that the majority of contemporary Ashkenazi Jews are primarily descended from Khazars - a Turkic-speaking people of the medieval Eurasian steppe - rather than from ancient Israelites of the Levant. Proponents of this specific formulation, associated principally with geneticist Eran Elhaik, argue that genetic evidence supports a Khazar origin for Ashkenazi Jews, with only a minority of ancestry traceable to the ancient Near East. This position represents a modern, genomic-era reformulation of the older Khazar hypothesis and is contested by a majority of population geneticists, who hold that Ashkenazi Jews derive substantially from Levantine ancestors.

Elhaik and those who accept his analysis advance several interlocking claims:

Genomic distance and ancestry inference. Elhaik's 2012 paper in Genome Biology and Evolution argued, on the basis of genome-wide SNP analysis, that Ashkenazi Jews cluster genetically closer to Caucasian populations - particularly Armenians and Georgians - than to Middle Eastern populations. He interpreted this proximity as evidence of substantial Khazar admixture, transmitted through the population of the historical Khazar Khaganate, which occupied the North Caucasus and Pontic steppe region roughly between the 7th and 10th centuries CE.¹⁾

The Rhineland hypothesis as the alternative. Elhaik frames his work explicitly as a test between two competing models: the Rhineland hypothesis, which holds that Ashkenazi Jews descend from Levantine Jews who migrated through Italy and into the Rhineland, and the Khazarian hypothesis, which holds that they descend largely from Khazar converts. He contends that the demographic arithmetic of the Rhineland model is implausible - arguing that the small medieval Jewish communities of the Rhineland could not have expanded to produce the large Ashkenazi population of early modern Eastern Europe without substantial local conversion and admixture.²⁾

Conversion and demographic plausibility. A recurring argument in this viewpoint is that mass conversion of Khazars, or at minimum substantial intermarriage between Jewish merchants and Khazar converts, provides a demographically credible explanation for the rapid population growth of Ashkenazi Jews in Eastern Europe. Proponents argue that no purely endogamous descent from a small Levantine founding population can account for the numbers.

Critique of reference population choices. Elhaik has argued that studies reaching different conclusions - concluding substantial Levantine ancestry for Ashkenazi Jews - have used inappropriate or circular reference populations. He contends that using modern Middle Eastern Jewish populations as proxies for ancient Israelites presupposes the conclusion, since those populations may themselves have been reshaped by historical events.

Geographic and linguistic circumstantial evidence. Supporters of the Elhaik viewpoint sometimes cite the geographic distribution of early Ashkenazi settlement in Eastern Europe, the origins of Yiddish (pointing to theories that locate its roots in the Slavic or Turkic east rather than the medieval Rhineland), and historical accounts of Khazar conversion as converging lines of evidence consistent with the genomic claims.

The broader Khazar hypothesis predates Elhaik by many decades. The idea that Ashkenazi Jews descend substantially or primarily from Khazar converts entered serious intellectual discourse through the work of historian Arthur Koestler, whose 1976 book The Thirteenth Tribe synthesized earlier scholarship and brought the argument to a wide readership.³⁾ Koestler drew on earlier researchers including D.M. Dunlop and relied on medieval chronicles describing the Khazar royal court's conversion to Judaism, probably in the 8th or 9th century CE.

Elhaik's contribution was to reframe the question as amenable to genomic resolution. His 2012 paper was the first to use genome-wide SNP data to argue explicitly for the Khazarian hypothesis against the Rhineland alternative. It attracted significant attention - and significant criticism - from population geneticists. Elhaik subsequently expanded and defended his analysis, including a 2016 paper arguing that geographic coordinates of Ashkenazi communities could be traced back to a region in present-day northeastern Turkey, which he associated with a Khazar-descended population he termed “Ashkenazic Jews' cosmopolitan ancestors” or the “Iranian plateau” component.⁴⁾

The viewpoint draws on a tradition of scholarship - including work by Shlomo Sand in The Invention of the Jewish People (2008)⁵⁾ - that interrogates the relationship between modern Jewish identity and claims of ancient biological descent. Elhaik's work is distinguished from Sand's in being specifically genomic rather than primarily historiographical.

Eran Elhaik is the central figure of this specific viewpoint. A geneticist who held positions at Johns Hopkins University and the University of Sheffield, Elhaik published the primary genomic papers arguing for the Khazarian hypothesis. He has maintained his position in the face of published critiques and has argued that methodological disagreements - particularly over reference population selection - explain the divergence between his findings and those of other population geneticists.

Arthur Koestler (1905-1983), while working from historical rather than genomic evidence, is the intellectual forerunner whose work Elhaik's analysis is often seen as attempting to confirm or refute. Koestler himself was of Ashkenazi Jewish origin and stated that his motivation was partly to undermine the basis of racial antisemitism by severing the genealogical claim to the Levant.

Shlomo Sand, an Israeli historian, has argued from historical and textual grounds that the concept of a continuous Jewish people with common descent is a modern nationalist construction. While not a geneticist, his work is frequently cited by those sympathetic to the Elhaik viewpoint as converging historiographical support.

Within the camp of those sympathetic to a Khazar-origin account, there is disagreement about the degree of Khazar ancestry claimed. Some hold a strong version - that Khazar ancestry is the primary or dominant component of Ashkenazi Jewish ancestry. Others hold a weaker version - that Khazar admixture was significant but not dominant, supplementing a Levantine founding population. Elhaik's own published analyses have varied in emphasis across papers, and critics within the sympathetic camp sometimes argue that his reference population choices introduce their own circularity.

There is also debate about the historical extent of the Khazar conversion. Medieval sources describe the conversion of the Khazar royal house and possibly the nobility, but the depth of conversion among the general population is disputed. Those who hold the strong genomic thesis must also hold that mass conversion or descent from converts occurred at the population level, which some historians within the broadly sympathetic tradition regard as unsupported by the textual record.

• Khazar Hypothesis (main topic)
• Rhineland Hypothesis Viewpoint
• History of the Khazar Hypothesis
• Khazar Hypothesis Debate
• Ashkenazi Jewish Origins - Genetics Consensus
• Khazars
• Ashkenazi Jews

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